/* ============================================================
   v3 DEV-DOCS + UTILITY surface, scoped under .v3-dev.
   Ground truth: docs.php (.v3-docs), the approved technical
   exemplar, ported to a shared stylesheet for the dev/utility
   family: api.php, developers/api.php, developers/cli.php,
   mcp-server.php, contact.php, assessment.php, 404.php.
   READING/WORKING SURFACES: light, calm, cool ladder, NO orange
   (these pages measure nothing), NO dark bands mid-page (the
   shared footer carries the dark register), NO ambient loops.
   Motion is one-shot section reveals only, gated behind
   html.motion; reduced motion renders fully static.
   Flat 2px radii, zero shadows.
   ============================================================ */
.v3-dev{
  --ink:#141519;        /* UI, buttons, headings, body text           */
  --graphite:#2A2D31;   /* strong meta, firm hairline, structure      */
  --muted:#8E9296;      /* mono labels, kickers, captions             */
  --sec:#565B60;        /* secondary body + paragraph text            */
  --frame:#7F858A;      /* the corner registration marks (firm)       */
  --paper:#FFFFFF;      /* cool clean white: entity/card/surface fill */
  --ground:#FCFDFD;     /* cool near-white page body ground           */
  --board:#F0F2F3;      /* cool light board behind the surfaces       */
  --board-2:#E9ECEE;    /* firmer cool board tone                     */
  --rule:#E6E9EB;       /* cool hairline on paper                     */
  --rule-2:#D7DBDE;     /* firmer cool hairline                      */
  --brand:#5F67BB;      /* logo indigo + the one signature corner     */
  --mono:'JetBrains Mono',ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --sans:'Space Grotesk',-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  display:block; background:var(--ground); color:var(--ink);
  font-family:var(--sans); font-size:16px; line-height:1.58;
  font-variant-numeric:tabular-nums; -webkit-font-smoothing:antialiased;
}
.v3-dev *,.v3-dev *::before,.v3-dev *::after{ box-sizing:border-box; }
.v3-dev a{ color:inherit; }
.v3-dev b,.v3-dev strong{ font-weight:600; }
.v3-dev h1,.v3-dev h2,.v3-dev h3{ margin:0; letter-spacing:-0.03em; text-wrap:balance; font-weight:600; }
.v3-dev p{ margin:0; }
.v3-dev img{ max-width:100%; display:block; }

.v3-dev .wrap{ max-width:1120px; margin:0 auto; padding:0 28px; }

/* ---------- DOC SHELL: hairline TOC rail + reading column ---------- */
.v3-dev .doc-shell{ display:grid; grid-template-columns:236px minmax(0,1fr); gap:56px; padding:44px 0 96px; align-items:start; }
.v3-dev .doc-shell--solo{ grid-template-columns:minmax(0,1fr); gap:0; }

/* --- the TOC rail: sticky, hairline groups, ink current-tick --- */
.v3-dev .doc-toc{ position:sticky; top:92px; min-width:0; }
.v3-dev .doc-toc-group{ margin-bottom:24px; }
.v3-dev .doc-toc-group:last-child{ margin-bottom:0; }
.v3-dev .doc-toc-group h2{ font:600 10.5px var(--mono); letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin:0 0 10px; }
.v3-dev .doc-toc-list{ list-style:none; margin:0; padding:0; }
.v3-dev .doc-toc-list a{ display:block; padding:6px 0 6px 14px; font:400 13.5px var(--sans); letter-spacing:-0.005em; color:var(--sec); text-decoration:none; border-left:1px solid var(--rule); transition:color .16s ease, border-color .16s ease; }
.v3-dev .doc-toc-list a:hover{ color:var(--ink); border-left-color:var(--rule-2); }
.v3-dev .doc-toc-list a.cur{ color:var(--ink); font-weight:500; border-left:2px solid var(--ink); padding-left:13px; }

/* --- the content column --- */
.v3-dev .doc-body{ min-width:0; max-width:760px; scroll-margin-top:92px; }
.v3-dev .crumbs{ display:flex; align-items:center; gap:9px; font:500 11px var(--mono); letter-spacing:.05em; color:var(--muted); margin-bottom:18px; flex-wrap:wrap; }
.v3-dev .crumbs a{ color:var(--sec); text-decoration:none; }
.v3-dev .crumbs a:hover{ color:var(--ink); }
.v3-dev .crumbs .sep{ color:var(--rule-2); }
.v3-dev .crumbs .cur{ color:var(--ink); }
.v3-dev .doc-eyebrow{ font:500 11px var(--mono); letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-bottom:14px; }
/* 2026-07-10 consistency pass: the eyebrow is a <p> inside .doc-body, so `.doc-body p`
   (0,2,1) below beat this rule's font-size and the kicker rendered 15px on every
   doc-shell page (mcp-server, developers/api|cli, contact) while the rest of the site
   runs the 11px/.2em mono kicker. Pin it at higher specificity. */
.v3-dev .doc-body p.doc-eyebrow{ font-size:11px; line-height:1.6; max-width:none; }
.v3-dev .doc-body h1{ font-size:clamp(32px,4.6vw,45px); font-weight:600; letter-spacing:-0.035em; line-height:1.04; color:var(--ink); margin:0 0 12px; }
.v3-dev .doc-lead{ font-size:17px; line-height:1.6; color:var(--sec); max-width:62ch; margin:0 0 22px; }
.v3-dev .doc-body h2{ font-size:22px; font-weight:600; letter-spacing:-0.025em; color:var(--ink); margin:44px 0 12px; scroll-margin-top:92px; }
.v3-dev .doc-body h3{ font-size:16px; font-weight:600; letter-spacing:-0.01em; color:var(--ink); margin:28px 0 8px; scroll-margin-top:92px; }
.v3-dev .doc-body p{ font-size:15px; line-height:1.68; color:var(--sec); margin:0 0 14px; max-width:66ch; }
.v3-dev .doc-body p b,.v3-dev .doc-body li b{ color:var(--ink); font-weight:600; }
.v3-dev a.ln{ color:var(--ink); font-weight:500; text-decoration:underline; text-underline-offset:3px; text-decoration-color:var(--rule-2); }
.v3-dev a.ln:hover{ text-decoration-color:var(--ink); }

/* --- top CTA row + buttons (ink on light, sharp 2px, no shadows) --- */
.v3-dev .doc-cta{ display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin:0 0 10px; }
.v3-dev .doc-btn{ display:inline-block; padding:11px 22px; border-radius:2px; font:600 14px var(--sans); text-decoration:none; border:1px solid var(--graphite); color:var(--ink); background:transparent; letter-spacing:-0.01em; cursor:pointer; transition:background .16s ease, color .16s ease, border-color .16s ease; }
.v3-dev .doc-btn:hover{ background:rgba(20,21,25,.05); border-color:var(--ink); }
.v3-dev .doc-btn.primary{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.v3-dev .doc-btn.primary:hover{ background:#000; border-color:#000; }
.v3-dev .doc-btn.sm{ padding:8px 14px; font-size:12.5px; }
.v3-dev .doc-btn.sm svg{ display:inline-block; vertical-align:-2px; margin-right:6px; }
.v3-dev .doc-btn.block{ display:block; width:100%; text-align:center; }
.v3-dev .doc-btn:disabled{ opacity:.55; cursor:default; }
.v3-dev .doc-micro{ font-size:12px; color:var(--muted); margin:0 0 8px; }

/* --- mono fact row (trust items rendered as drafting captions) --- */
.v3-dev .facts{ display:flex; flex-wrap:wrap; gap:8px 22px; margin:16px 0 0; padding:0; list-style:none; }
.v3-dev .facts li{ display:inline-flex; align-items:center; gap:8px; font:500 11px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--muted); }
.v3-dev .facts li::before{ content:""; width:5px; height:5px; background:var(--graphite); flex:0 0 auto; }

/* --- deprecation / status chip: mono, hairline, no coloured fill --- */
.v3-dev .chip-flag{ display:inline-flex; align-items:center; gap:7px; font:600 10px var(--mono); letter-spacing:.18em; text-transform:uppercase; color:var(--graphite); border:1px solid var(--rule-2); border-radius:2px; padding:4px 9px; background:var(--paper); margin-bottom:16px; }
.v3-dev .chip-flag .dot{ width:5px; height:5px; background:var(--graphite); }

/* lists: square graphite bullets + mono numeric markers (drafting grammar) */
.v3-dev .doc-body ul,.v3-dev .doc-body ol{ list-style:none; margin:0 0 18px; padding:0; }
.v3-dev .doc-body li{ position:relative; font-size:15px; line-height:1.6; color:var(--sec); margin:8px 0; max-width:64ch; }
.v3-dev .doc-body ul li{ padding-left:18px; }
.v3-dev .doc-body ul li::before{ content:""; position:absolute; left:0; top:9px; width:5px; height:5px; background:var(--graphite); }
.v3-dev .doc-body ol{ counter-reset:doc; }
.v3-dev .doc-body ol li{ padding-left:28px; counter-increment:doc; }
.v3-dev .doc-body ol li::before{ content:counter(doc,decimal-leading-zero); position:absolute; left:0; top:2px; font:500 11px var(--mono); letter-spacing:.04em; color:var(--muted); }
.v3-dev .doc-body ol.steps li{ margin:16px 0; }
.v3-dev .doc-body ol.steps li h3{ margin:0 0 4px; }

/* inline code chips */
.v3-dev :not(pre) > code{ font-family:var(--mono); font-size:.85em; background:var(--board); border:1px solid var(--rule); border-radius:2px; padding:1px 5px; color:var(--ink); }

/* --- CODE BLOCK: cool panel, hairline, mono language tag, ink text,
       NO syntax rainbow. Comments are the single muted emphasis. --- */
.v3-dev .code{ margin:20px 0 22px; background:var(--paper); border:1px solid var(--rule-2); border-radius:2px; }
.v3-dev .code-head{ display:flex; align-items:center; gap:12px; padding:9px 14px; border-bottom:1px solid var(--rule); background:var(--board); overflow:hidden; }
.v3-dev .code-lang{ flex:0 0 auto; font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--graphite); }
.v3-dev .code-name{ margin-left:auto; min-width:0; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; font:500 10px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--muted); }
.v3-dev .code-scroll{ overflow-x:auto; }
.v3-dev .code pre{ margin:0; padding:15px 16px; font:400 13px/1.72 var(--mono); color:var(--ink); font-variant-numeric:tabular-nums; }
.v3-dev .code pre code{ background:none; border:0; padding:0; font:inherit; color:inherit; }
.v3-dev .code .cm{ color:var(--muted); }          /* comment, the one muted emphasis */
.v3-dev .code .em{ color:var(--graphite); }       /* one optional graphite emphasis  */

/* --- COMMAND ROW: one-line install command, board fill, copy affordance --- */
.v3-dev .cmd{ display:flex; align-items:center; gap:10px; background:var(--paper); border:1px solid var(--rule-2); border-radius:2px; padding:10px 12px 10px 14px; max-width:560px; }
.v3-dev .cmd .ps{ font:600 13px var(--mono); color:var(--muted); flex:0 0 auto; }
.v3-dev .cmd code{ background:none; border:0; padding:0; font:500 13px var(--mono); color:var(--ink); white-space:nowrap; overflow-x:auto; flex:1 1 auto; min-width:0; }
.v3-dev .cmd-copy{ flex:0 0 auto; display:inline-flex; align-items:center; gap:6px; font:600 10.5px var(--mono); letter-spacing:.12em; text-transform:uppercase; color:var(--graphite); background:var(--board); border:1px solid var(--rule-2); border-radius:2px; padding:6px 10px; cursor:pointer; transition:background .16s ease, color .16s ease, border-color .16s ease; }
.v3-dev .cmd-copy:hover{ background:var(--ink); color:var(--paper); border-color:var(--ink); }
.v3-dev .cmd-copy.copied{ background:var(--ink); color:var(--paper); border-color:var(--ink); }

/* --- CALLOUT / NOTE: hairline box, firm graphite left rule, mono label. --- */
.v3-dev .note{ margin:22px 0; padding:15px 18px; background:var(--paper); border:1px solid var(--rule); border-left:2px solid var(--graphite); border-radius:2px; }
.v3-dev .note-lab{ display:block; font:600 10px var(--mono); letter-spacing:.18em; text-transform:uppercase; color:var(--muted); margin-bottom:7px; }
.v3-dev .note p{ margin:0; font-size:14px; line-height:1.6; color:var(--sec); max-width:62ch; }
.v3-dev .note p + p{ margin-top:8px; }
.v3-dev .note .note-strong{ color:var(--ink); font-weight:600; }

/* --- REFERENCE TABLE: mono uppercase heads over a firm graphite rule --- */
.v3-dev .ref-scroll{ overflow-x:auto; margin:16px 0 24px; }
.v3-dev table.ref{ width:100%; border-collapse:collapse; font-size:13.5px; line-height:1.5; }
.v3-dev table.ref th{ font:500 10px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--muted); text-align:left; padding:0 20px 9px 0; border-bottom:1px solid var(--graphite); white-space:nowrap; }
.v3-dev table.ref td{ padding:11px 20px 11px 0; border-bottom:1px solid var(--rule); color:var(--ink); vertical-align:top; }
.v3-dev table.ref tr:last-child td{ border-bottom:0; }
.v3-dev table.ref th:last-child,.v3-dev table.ref td:last-child{ padding-right:0; }
.v3-dev table.ref td.m{ font-family:var(--mono); font-size:12.5px; letter-spacing:.005em; color:var(--graphite); white-space:nowrap; }
.v3-dev table.ref td.d{ color:var(--sec); min-width:16ch; }
.v3-dev .method{ display:inline-block; font:600 10px var(--mono); letter-spacing:.08em; color:var(--graphite); border:1px solid var(--rule-2); border-radius:2px; padding:2px 7px; }

/* --- section caption (mono, hairline lead) --- */
.v3-dev .part-cap{ display:flex; align-items:center; gap:12px; font:600 11px var(--mono); letter-spacing:.18em; text-transform:uppercase; color:var(--muted); margin:54px 0 6px; }
.v3-dev .part-cap .n{ color:var(--ink); }
.v3-dev .part-cap .ln{ flex:1 1 auto; height:1px; background:var(--rule); }

/* --- CONCEPT + NEXT-STEP CARDS: framed entities, thin cool hairline +
       the one indigo signature corner. --- */
.v3-dev .concept-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin:20px 0 24px; }
.v3-dev .concept-grid--2{ grid-template-columns:1fr 1fr; }
.v3-dev .concept{ position:relative; background:var(--paper); border:1px solid var(--rule); padding:20px 20px 22px; display:flex; flex-direction:column; gap:9px; }
.v3-dev .concept::after{ content:""; position:absolute; right:-1px; bottom:-1px; width:14px; height:14px; border-right:2px solid var(--brand); border-bottom:2px solid var(--brand); }
.v3-dev .concept .c-kick{ font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); }
.v3-dev .concept h3{ font-size:16px; font-weight:600; letter-spacing:-0.015em; color:var(--ink); margin:0; }
.v3-dev .concept p{ font-size:13.5px; line-height:1.54; color:var(--sec); margin:0; max-width:none; }
.v3-dev .concept .chip{ display:inline-block; align-self:flex-start; margin-top:4px; font:500 11.5px var(--mono); color:var(--graphite); background:var(--board); border:1px solid var(--rule); border-radius:2px; padding:4px 9px; }

.v3-dev .next-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; margin:14px 0 4px; }
.v3-dev a.next{ position:relative; display:flex; flex-direction:column; gap:6px; padding:18px 20px 20px; background:var(--paper); border:1px solid var(--rule); text-decoration:none; transition:background .16s ease; }
.v3-dev a.next::after{ content:""; position:absolute; right:-1px; bottom:-1px; width:14px; height:14px; border-right:2px solid var(--brand); border-bottom:2px solid var(--brand); }
.v3-dev a.next:hover{ background:rgba(20,21,25,.02); }
.v3-dev a.next .n-kick{ font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); }
.v3-dev a.next .n-t{ display:inline-flex; align-items:center; gap:7px; font:600 15px var(--sans); letter-spacing:-0.015em; color:var(--ink); }
.v3-dev a.next .n-t .ar{ color:var(--graphite); }
.v3-dev a.next .n-d{ font-size:13px; line-height:1.5; color:var(--sec); }

/* --- TERMINAL / TRANSCRIPT PANEL (the Claude Code demo): flat, hairline --- */
.v3-dev .term{ margin:20px 0 8px; background:var(--paper); border:1px solid var(--rule-2); border-radius:2px; }
.v3-dev .term-head{ display:flex; align-items:center; gap:12px; padding:9px 14px; border-bottom:1px solid var(--rule); background:var(--board); }
.v3-dev .term-app{ font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--graphite); }
.v3-dev .term-status{ margin-left:auto; display:inline-flex; align-items:center; gap:7px; font:500 10px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--muted); }
.v3-dev .term-status .dot{ width:5px; height:5px; background:var(--graphite); }
.v3-dev .term-body{ padding:16px 18px 18px; }
.v3-dev .term-line{ font-size:14px; line-height:1.6; color:var(--sec); margin:0 0 10px; }
.v3-dev .term-line:last-child{ margin-bottom:0; }
.v3-dev .term-line b{ color:var(--ink); }
.v3-dev .term-prompt{ font:500 13px var(--mono); color:var(--ink); }
.v3-dev .term-prompt .ps{ color:var(--muted); margin-right:8px; }
.v3-dev .term-src{ font:600 10px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--muted); border-top:1px solid var(--rule); padding-top:10px; margin:12px 0 10px; }
.v3-dev .term-src b{ color:var(--ink); letter-spacing:.06em; }
.v3-dev .term-item{ position:relative; padding-left:16px; margin:0 0 10px; font-size:14px; line-height:1.55; color:var(--sec); }
.v3-dev .term-item::before{ content:""; position:absolute; left:0; top:9px; width:5px; height:5px; background:var(--graphite); }
.v3-dev .term-item b{ color:var(--ink); }
.v3-dev .term-quote{ display:block; font-size:12.5px; font-style:italic; color:var(--muted); margin-top:2px; }
.v3-dev .term-flag{ display:inline-block; margin-left:8px; font:600 9px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--graphite); border:1px solid var(--rule-2); border-radius:2px; padding:1px 6px; vertical-align:1px; }
.v3-dev .term-sum{ border-top:1px solid var(--rule); padding-top:12px; margin-top:12px; }

/* ================= UTILITY: CONTACT ================= */
.v3-dev .split{ display:grid; grid-template-columns:minmax(0,1.25fr) minmax(0,1fr); gap:56px; align-items:start; margin-top:34px; }
.v3-dev .form{ display:flex; flex-direction:column; gap:16px; }
.v3-dev .f-row{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.v3-dev .f-field{ display:flex; flex-direction:column; gap:6px; }
.v3-dev .f-field label{ font:600 10.5px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); }
.v3-dev .f-field input,
.v3-dev .f-field select,
.v3-dev .f-field textarea{ width:100%; appearance:none; -webkit-appearance:none; background:var(--paper); border:1px solid var(--rule-2); border-radius:2px; padding:11px 13px; font:400 14.5px var(--sans); letter-spacing:-0.005em; color:var(--ink); transition:border-color .16s ease; }
.v3-dev .f-field textarea{ min-height:120px; resize:vertical; line-height:1.55; }
.v3-dev .f-field input::placeholder,.v3-dev .f-field textarea::placeholder{ color:var(--muted); }
.v3-dev .f-field input:focus,.v3-dev .f-field select:focus,.v3-dev .f-field textarea:focus{ border-color:var(--graphite); outline:none; }
.v3-dev .f-field select{ background-image:linear-gradient(45deg,transparent 49%,var(--graphite) 50%),linear-gradient(135deg,var(--graphite) 50%,transparent 51%); background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%; background-size:5px 5px,5px 5px; background-repeat:no-repeat; padding-right:34px; }
.v3-dev .f-status{ font-size:14px; line-height:1.5; }

.v3-dev .reach{ border:1px solid var(--rule); background:var(--paper); padding:22px 22px 8px; position:relative; }
.v3-dev .reach::after{ content:""; position:absolute; right:-1px; bottom:-1px; width:14px; height:14px; border-right:2px solid var(--brand); border-bottom:2px solid var(--brand); }
.v3-dev .reach-cap{ font:600 10px var(--mono); letter-spacing:.18em; text-transform:uppercase; color:var(--muted); margin-bottom:6px; }
.v3-dev .reach-row{ display:flex; flex-direction:column; gap:3px; padding:15px 0 16px; border-bottom:1px solid var(--rule); }
.v3-dev .reach-row:last-child{ border-bottom:0; }
.v3-dev .reach-l{ font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); }
.v3-dev .reach-h{ font-size:14.5px; font-weight:600; letter-spacing:-0.01em; color:var(--ink); }
.v3-dev .reach-p{ font-size:13px; line-height:1.55; color:var(--sec); }
.v3-dev .reach-row a{ align-self:flex-start; margin-top:3px; font:500 13px var(--sans); color:var(--ink); text-decoration:underline; text-underline-offset:3px; text-decoration-color:var(--rule-2); }
.v3-dev .reach-row a:hover{ text-decoration-color:var(--ink); }

/* ================= UTILITY: ASSESSMENT ================= */
.v3-dev .as-wrap{ max-width:680px; margin:0 auto; }
.v3-dev .as-head{ text-align:left; padding:44px 0 8px; max-width:680px; margin:0 auto; }
.v3-dev .as-card{ position:relative; background:var(--paper); border:1px solid var(--rule); border-radius:2px; padding:26px 26px 28px; margin:0 0 18px; }
.v3-dev .as-card::after{ content:""; position:absolute; right:-1px; bottom:-1px; width:14px; height:14px; border-right:2px solid var(--brand); border-bottom:2px solid var(--brand); }
.v3-dev .as-card h2{ font-size:20px; letter-spacing:-0.02em; margin:0 0 18px; }
.v3-dev .as-card h3{ font-size:15px; font-weight:600; letter-spacing:-0.01em; margin:0 0 14px; }
.v3-dev .as-count{ display:inline-flex; align-items:center; gap:8px; margin-top:16px; padding:6px 12px; background:var(--paper); border:1px solid var(--rule); border-radius:2px; font:500 12px var(--sans); color:var(--sec); }
.v3-dev .as-count::before{ content:""; width:5px; height:5px; background:var(--graphite); }
.v3-dev .as-count b{ color:var(--ink); }
.v3-dev .as-prog{ height:2px; background:var(--rule); margin:34px 0 10px; }
.v3-dev .as-prog-fill{ height:100%; background:var(--ink); }
.v3-dev .as-meta{ display:flex; justify-content:space-between; font:500 10.5px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); margin-bottom:16px; }
.v3-dev .as-dim{ font:600 10px var(--mono); letter-spacing:.18em; text-transform:uppercase; color:var(--muted); margin-bottom:10px; }
.v3-dev .as-q{ font-size:18px; font-weight:600; letter-spacing:-0.02em; line-height:1.35; color:var(--ink); margin-bottom:20px; text-wrap:balance; }
.v3-dev .as-opts{ display:flex; flex-direction:column; gap:8px; }
.v3-dev .as-opt{ display:flex; gap:14px; align-items:flex-start; width:100%; text-align:left; background:var(--paper); border:1px solid var(--rule-2); border-radius:2px; padding:13px 15px; cursor:pointer; font-family:var(--sans); transition:background .16s ease, border-color .16s ease; }
.v3-dev .as-opt:hover{ background:var(--board); border-color:var(--graphite); }
.v3-dev .as-opt-letter{ flex:0 0 auto; font:600 11px var(--mono); color:var(--graphite); border:1px solid var(--rule-2); border-radius:2px; width:24px; height:24px; display:inline-flex; align-items:center; justify-content:center; margin-top:1px; }
.v3-dev .as-opt:hover .as-opt-letter{ background:var(--ink); border-color:var(--ink); color:var(--paper); }
.v3-dev .as-opt-body{ display:flex; flex-direction:column; gap:2px; min-width:0; }
.v3-dev .as-opt-h{ font-size:14.5px; font-weight:600; letter-spacing:-0.01em; color:var(--ink); }
.v3-dev .as-opt-d{ font-size:13px; line-height:1.5; color:var(--sec); }
.v3-dev .as-channels{ display:grid; grid-template-columns:1fr 1fr; gap:8px; margin-bottom:20px; }
.v3-dev .as-channel{ position:relative; }
.v3-dev .as-channel input{ position:absolute; opacity:0; inset:0; width:100%; height:100%; margin:0; cursor:pointer; }
.v3-dev .as-channel label{ display:flex; align-items:center; gap:10px; border:1px solid var(--rule-2); border-radius:2px; background:var(--paper); padding:10px 12px; font-size:13.5px; color:var(--sec); cursor:pointer; transition:background .16s ease, border-color .16s ease, color .16s ease; }
.v3-dev .as-channel label::before{ content:""; flex:0 0 auto; width:12px; height:12px; border:1px solid var(--rule-2); background:var(--paper); }
.v3-dev .as-channel input:checked + label{ border-color:var(--graphite); color:var(--ink); background:var(--board); }
.v3-dev .as-channel input:checked + label::before{ background:var(--ink); background-clip:content-box; padding:2px; box-sizing:border-box; border-color:var(--ink); }
.v3-dev .as-channel input:focus-visible + label{ border-color:var(--ink); }
.v3-dev .as-level{ display:inline-flex; align-items:center; gap:8px; font:600 11px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--ink); border:1px solid var(--graphite); border-radius:2px; background:var(--paper); padding:7px 13px; }
.v3-dev .as-level::before{ content:""; width:6px; height:6px; background:var(--brand); }
.v3-dev .as-stats{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:14px; }
.v3-dev .as-stat{ border:1px solid var(--rule); border-radius:2px; background:var(--paper); padding:14px 16px; }
.v3-dev .as-stat.you{ background:var(--board); border-color:var(--rule-2); }
.v3-dev .as-stat-l{ font:600 10px var(--mono); letter-spacing:.16em; text-transform:uppercase; color:var(--muted); margin-bottom:6px; }
.v3-dev .as-stat-v{ font-size:28px; font-weight:600; color:var(--ink); line-height:1; letter-spacing:-0.02em; }
.v3-dev .as-stat-s{ font-size:13px; color:var(--sec); margin-top:4px; }
.v3-dev .as-dim-row{ display:flex; align-items:center; justify-content:space-between; gap:16px; padding:9px 0; border-bottom:1px solid var(--rule); }
.v3-dev .as-dim-row:last-child{ border-bottom:0; }
.v3-dev .as-dim-name{ font-size:13.5px; color:var(--ink); }
.v3-dev .as-dim-tag{ display:inline-block; margin-left:8px; font:600 9px var(--mono); letter-spacing:.14em; text-transform:uppercase; color:var(--graphite); border:1px solid var(--rule-2); border-radius:2px; padding:1px 6px; vertical-align:1px; }
.v3-dev .as-dots{ display:flex; gap:5px; flex:0 0 auto; }
.v3-dev .as-dot{ width:9px; height:9px; border:1px solid var(--rule-2); background:var(--paper); }
.v3-dev .as-dot.filled{ background:var(--ink); border-color:var(--ink); }
.v3-dev .as-dot.low{ background:var(--brand); border-color:var(--brand); }
.v3-dev .as-share-row{ display:flex; gap:8px; align-items:center; margin-bottom:14px; flex-wrap:wrap; }
.v3-dev .as-share-input{ flex:1; min-width:0; padding:10px 13px; border:1px solid var(--rule-2); border-radius:2px; font:400 12.5px var(--mono); color:var(--sec); background:var(--board); outline:none; }
.v3-dev .as-share-btns{ display:flex; gap:8px; flex-wrap:wrap; }
.v3-dev .as-restart{ text-align:center; margin-top:22px; }
.v3-dev .as-restart a,.v3-dev .as-restart button{ background:none; border:0; padding:0; cursor:pointer; font:400 13px var(--sans); color:var(--muted); text-decoration:underline; text-underline-offset:3px; }
.v3-dev .as-restart a:hover,.v3-dev .as-restart button:hover{ color:var(--ink); }
.v3-dev .as-canvas-row{ display:flex; align-items:center; gap:14px; }
.v3-dev .as-err{ border:1px solid var(--rule); border-left:2px solid var(--graphite); background:var(--board); border-radius:2px; padding:10px 14px; font-size:13.5px; color:var(--ink); margin-bottom:16px; }

/* ================= UTILITY: 404 ================= */
.v3-dev .nf{ padding:96px 0 110px; }
.v3-dev .nf-inner{ max-width:680px; }
.v3-dev .nf-kick{ display:flex; align-items:center; gap:12px; font:500 11px var(--mono); letter-spacing:.2em; text-transform:uppercase; color:var(--muted); margin-bottom:22px; } /* 2026-07-10: 600→500, matches the sitewide kicker weight */
.v3-dev .nf-kick .n{ color:var(--ink); }
.v3-dev .nf-kick .ln{ width:56px; height:1px; background:var(--rule-2); }
.v3-dev .nf h1{ font-size:clamp(38px,6vw,58px); letter-spacing:-0.04em; line-height:1.02; color:var(--ink); margin:0 0 16px; }
.v3-dev .nf-p{ font-size:16px; line-height:1.6; color:var(--sec); max-width:52ch; margin:0 0 26px; }
.v3-dev .nf-actions{ display:flex; gap:12px; flex-wrap:wrap; margin-bottom:44px; }
.v3-dev .nf-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:16px; max-width:760px; }

/* ---------- motion: one-shot section reveals only, gated ---------- */
html.motion .v3-dev .v3-reveal{ opacity:0; transform:translateY(14px); transition:opacity .5s ease, transform .5s cubic-bezier(.2,.75,.2,1); }
html.motion .v3-dev .v3-reveal.in{ opacity:1; transform:none; }
html.motion .v3-dev{ scroll-behavior:auto; }

/* ---------- reduced motion: fully static settled states ---------- */
@media (prefers-reduced-motion:reduce){
  .v3-dev *,.v3-dev *::before,.v3-dev *::after{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}
html.reduce .v3-dev *,html.reduce .v3-dev *::before,html.reduce .v3-dev *::after{ animation:none !important; transition:none !important; }

/* ---------- responsive ---------- */
@media (max-width:980px){
  .v3-dev .doc-shell{ grid-template-columns:1fr; gap:0; padding:30px 0 84px; }
  .v3-dev .doc-toc{ position:static; padding-bottom:26px; margin-bottom:30px; border-bottom:1px solid var(--rule); }
  .v3-dev .doc-toc-group{ margin-bottom:18px; }
  .v3-dev .concept-grid,.v3-dev .concept-grid--2{ grid-template-columns:1fr; }
  .v3-dev .next-grid{ grid-template-columns:1fr; }
  .v3-dev .split{ grid-template-columns:1fr; gap:40px; }
}
@media (max-width:600px){
  .v3-dev .doc-shell{ padding:24px 0 68px; }
  .v3-dev .wrap{ padding:0 20px; }
  .v3-dev .doc-body h1{ font-size:clamp(30px,8.6vw,40px); }
  .v3-dev .f-row{ grid-template-columns:1fr; }
  .v3-dev .as-channels{ grid-template-columns:1fr; }
  .v3-dev .as-stats{ grid-template-columns:1fr; }
  .v3-dev .as-card{ padding:20px 18px 22px; }
  .v3-dev .nf{ padding:72px 0 84px; }
  .v3-dev .nf-grid{ grid-template-columns:1fr; }
  .v3-dev .cmd{ max-width:100%; }
  .v3-dev .cmd code{ white-space:nowrap; }
}